The Stovebolt Site Forums The Shop Area Engine Shop 7/8" Generator Pulley Help

Here is the info: MPB the belt p/n is 2190637 = Napa p/n NBH2528437 $29.99, specs outside circumferenece 44.3", top width .875"
With 55 amp generator p/n 2135530 = Napa p/n NBH2530467 $33.99, specs outside circumference 47.28", top width.9375.

Gates TR28437 (7/8 X 44 1/4)(22mm X 1125mm) - NAPA had it

Here it tis - check for it locally - Rockauto's shipping/taxes might be beatable

Here are other sources.